Eccentric tripping structure of circuit breaker

Abstract

An eccentric tripping structure of a circuit breaker comprises a movable iron core, a side tripping ejector rod is fixedly arranged on one side, located on the central axis of the movable iron core, of the movable iron core, and when a magnetic tripper acts, the movable iron core can drive the side tripping ejector rod to be in linkage with a lock catch in the moving process under the action of a magnetic field. The tripping ejector rod is arranged in a non-center mode and does not occupy the spatial position of the area where the central axis of the tripper is located, so that the mechanism base extends to the upper left side, the extension part of the contact supporting piece is matched with the characteristics of the shell in the opening process to achieve sealing of the contact part, air pressure at the opening position of the contact is increased, and then electric arc is transferred into an arc extinguish chamber. And the breaking capacity of the circuit breaker is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and specifically relates to an eccentric tripping structure of a circuit breaker. Background Art

[0002] Miniature circuit breakers, essential electrical components, play a control and protection role in power systems. Circuit breakers primarily consist of a conductive system, arc extinguishing system, and operating mechanism, with the trip unit being a crucial component of the operating mechanism. Existing miniature circuit breaker products feature a centrally located tripping rod that reciprocates. This structure occupies a significant area within the housing, preventing the rod's reciprocating motion from being effectively utilized.

[0003] Chinese Patent No. 201520047102.9 discloses a circuit breaker tripping mechanism comprising an electromagnetic system, a push rod connected to an internal iron core of the electromagnetic system so as to reciprocate linearly with the iron core, and a tripping mechanism adapted to be actuated by the push rod to trip the circuit breaker. The push rod also includes a push rod disposed between the push rod and the tripping mechanism, the push rod being detachably connected to the free end of the push rod by a removable structure. One side of the push rod is formed with a drive portion that deviates from the centerline of the push rod and corresponds to the tripping mechanism. The push rod structure of this circuit breaker tripping mechanism enables the push rod to shift its force point. When the centerline of the push rod deviates from the tripping mechanism, the push rod can actuate the tripping mechanism to achieve tripping. When the centerline of the push rod and the tripping mechanism are aligned, the push rod can be removed from the push rod. However, this technical solution, while adding a push rod to the push rod to achieve tripping on one side, still suffers from the drawback that the push rod's reciprocating motion occupies space within the housing, resulting in ineffective utilization of the space within the housing for the push rod's reciprocating motion. Utility Model Content

[0004] The purpose of the present utility model is to address the defect that the tripping push rod of the tripper in the above-mentioned existing miniature circuit breaker products is located at the center position and reciprocates, resulting in a large space occupied by the movement area of the push rod. The utility model provides an eccentric tripping structure of the circuit breaker, in which the tripping push rod is non-centrally arranged and does not occupy the middle space position of the area where the central axis of the tripper is located, thereby realizing the extension of the mechanism seat to the upper left side. During the opening process, the extended part of the contact support member and the shell feature cooperate to realize the sealing of the contact part, which is beneficial to increase the air pressure at the contact opening position, and then facilitates the transfer of the arc to the inside of the arc extinguishing chamber, thereby improving the breaking capacity of the circuit breaker.

[0005] Technical Solution

[0006] In order to achieve the above technical objectives, the present invention provides an eccentric tripping structure for a circuit breaker, which includes a movable iron core and is characterized in that a side tripping push rod is fixedly mounted on one side of the movable iron core located on its central axis. When the magnetic release is actuated, the movable iron core can drive the side tripping push rod to move in conjunction with the lock during the movement under the action of the magnetic field.

[0007] In one embodiment, the side tripping ejector rod is fixedly mounted on the outer edge surface of the moving iron core.

[0008] In one embodiment, a striking surface is provided on the side tripping top rod, and a force-bearing surface is provided on the lock buckle at a position corresponding to the striking surface. There is an overlapping area between the striking surface and the force-bearing surface when the moving contact and the static contact are in the closed state to ensure that the side tripping top rod can be linked with the lock buckle.

[0009] In one embodiment, the side tripping ejector pin extends a first limiting protrusion toward one side of the magnetic yoke, and the first limiting protrusion cooperates with the surface of the magnetic yoke to limit the initial position of the moving iron core.

[0010] In one embodiment, a protrusion is provided on one side surface of the side tripping ejector pin, and the protrusion cooperates with the surface of the sleeve where the moving iron core is located to limit the initial position of the moving iron core.

[0011] In one embodiment, a second limiting protrusion is provided on the shell at a position corresponding to the position of the striking surface and the force-bearing surface when the moving contact and the static contact b are in the closed state, and the second limiting protrusion can limit the lateral deviation of the force-bearing surface of the side tripping push rod and the lock.

[0012] Furthermore, the side tripping push rod is in a "Z" shape.

[0013] In one embodiment, a sealing rib is provided on the housing and cooperates with an extension portion on the contact support to enhance the sealing of the contact system when the moving contact and the static contact are in an open state.

[0014] Beneficial effects

[0015] The utility model provides an eccentric tripping structure for a circuit breaker, comprising a movable iron core with a side tripping push rod fixedly mounted on one side of the movable iron core's central axis. When a magnetic tripper is actuated, the movable iron core, under the action of a magnetic field, can drive the side tripping push rod to engage with a lock. The tripping push rod is non-centrally positioned, not occupying the central space of the tripper's central axis, thereby extending the mechanism seat to the upper left. During the opening process, the extended portion of the contact support cooperates with the housing to seal the contacts, thereby increasing the air pressure at the contact opening point, thereby facilitating the arc's transfer to the interior of the arc extinguishing chamber and improving the circuit breaker's breaking capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Attachment Figure 1 This is a schematic diagram of the installation of the magnetic release in Example 1 of the present utility model;

[0018] Attachment Figure 2 This is a schematic diagram of the side tripping ejector linkage in Example 1 of the present utility model;

[0019] Attachment Figure 3 This is a schematic diagram of the connection between the side tripping ejector rod and the moving iron core in Example 1 of the present utility model;

[0020] Attachment Figure 4 This is a schematic diagram of the side tripping ejector in Example 1 of the present utility model;

[0021] Attachment Figure 5 This is a schematic diagram of the side tripping ejector in Example 2 of the present utility model; DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0025] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0027] Example 1

[0028] As attached Figure 1 As shown in FIG. 1 , an eccentric tripping structure for a circuit breaker includes a movable iron core 1, with a side tripping push rod 2 fixedly mounted on one side of the movable iron core 1 on its central axis. When the magnetic trip device is actuated, the movable iron core 1 moves under the action of a magnetic field, thereby driving the side tripping push rod 2 to move in conjunction with a lock 3. Specifically, in the closed state, when the magnetic trip device C is actuated, the movable iron core 1, under the action of the magnetic field attraction, drives the side tripping push rod 2 to push the lock 3 to achieve tripping.

[0029] In this embodiment, as shown in the attached Figure 4 As shown in the figure, the side tripping rod 2 is in the shape of "Z". Figure 2 As shown, the side tripping rod 2 is fixedly mounted on the outer edge of the moving iron core 1. The side tripping rod 2 is preferably made of metal material, and the side tripping rod 2 is fixed to the moving iron core 1 by welding, or is made of plastic material and fixed to the moving iron core 1 by hot riveting, or can be made into an integral part with the moving iron core 1. Figure 3As shown, the side trip pin 2 is provided with a striking surface 201, and the lock catch 3 is provided with a force-bearing surface 301 corresponding to the striking surface 201. There is an overlapping area between the striking surface 201 and the force-bearing surface 301 when the moving contact a and the static contact b are in the closed state. This ensures that in the closed state, after the current reaches the operating current of the magnetic trip device c, the moving iron core 1 drives the side trip pin 2 to move, and the corresponding striking surface 201 strikes the force-bearing surface 301 of the lock catch 3, causing the lock catch 3 to rotate, thereby achieving the mechanism tripping and opening the contacts. The side trip pin 2 extends a first limiting protrusion 202 toward the side of the magnetic yoke 4. The first limiting protrusion 202 cooperates with the surface of the magnetic yoke 4 to limit the initial position of the moving iron core 1.

[0030] As attached Figure 1 As shown, a second limiting protrusion 501 is provided on the housing 5 at a position corresponding to the position of the striking surface 201 and the force-bearing surface 301 when the moving contact a and the static contact b are in the closed state. The second limiting protrusion 501 can limit the lateral deviation of the force-bearing surface 301 of the side tripping ejector rod 2 and the lock 3, thereby improving the tripping reliability. At the same time, a sealing rib 502 is provided on the housing 5, which cooperates with the extension 601 on the contact support 6 to enhance the sealing of the contact system when the moving contact a and the static contact b are in the open state. Specifically, it can achieve the separation of the contact system and the mechanism system in two areas during the contact opening process, thereby achieving a sealing effect of the contact system, thereby increasing the air pressure at the contact opening position and facilitating the transfer of the arc to the interior of the arc extinguishing chamber 7.

[0031] This embodiment provides an eccentric tripping structure for a circuit breaker. When the magnetic tripper is activated, the movable iron core 1, in its movement under the influence of the magnetic field, drives the side tripping pin 2 and the lock 3 in a coordinated manner. The tripping pin is positioned off-center, eliminating the space occupied by the tripper's central axis. This allows the mechanism seat to extend to the upper left. During the opening process, the extended portion of the contact support cooperates with the housing features to seal the contacts, increasing the pressure at the contact opening point. This, in turn, facilitates arc transfer into the arc extinguishing chamber, thereby improving the circuit breaker's breaking capacity.

[0032] Example 2

[0033] As attached Figure 5 As shown, in this embodiment, a protrusion 203 is provided on one side of the side tripping push rod 2. This protrusion 203 cooperates with the surface of the sleeve in which the movable iron core 1 is located to restrict the initial position of the movable iron core 1. Furthermore, this allows the side tripping push rod 2 to strike the lock 3 to release the lock. The remaining structure is the same as in Example 1.

[0034] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An eccentric tripping structure of a circuit breaker, comprising a moving iron core (1), characterized in that: A side tripping push rod (2) is fixedly mounted on one side of the central axis of the moving iron core (1). When the magnetic release is actuated, the moving iron core (1) can drive the side tripping push rod (2) to move in conjunction with the lock (3) during movement under the action of the magnetic field.

2. The eccentric tripping structure of a circuit breaker according to claim 1, wherein: The side tripping ejector rod (2) is fixedly mounted on the outer edge surface of the moving iron core (1).

3. The eccentric tripping structure of a circuit breaker according to claim 1, wherein: The side tripping top rod (2) is provided with a striking surface (201), and the lock buckle (3) is provided with a force-bearing surface (301) at a position corresponding to the striking surface (201). An overlapping area exists between the striking surface (201) and the force-bearing surface (301) when the moving contact (a) and the static contact (b) are in a closed state, so as to ensure that the side tripping top rod (2) can be linked with the lock buckle (3).

4. The eccentric tripping structure of a circuit breaker according to claim 1, wherein: The side tripping push rod (2) extends a first limiting protrusion (202) toward one side of the magnetic yoke (4); the first limiting protrusion (202) cooperates with the surface of the magnetic yoke (4) to limit the initial position of the moving iron core (1).

5. The eccentric tripping structure of a circuit breaker according to claim 1, characterized in that: A protrusion (203) is provided on one side surface of the side tripping ejector rod (2); the protrusion (203) cooperates with the surface of the sleeve where the moving iron core (1) is located to limit the initial position of the moving iron core (1).

6. The eccentric tripping structure of a circuit breaker according to claim 3, characterized in that: A second limiting protrusion (501) is provided on the housing (5) at a position corresponding to the positions of the striking surface (201) and the force-bearing surface (301) when the moving contact (a) and the static contact (b) are in a closed state. The second limiting protrusion (501) can limit the lateral deviation of the force-bearing surface (301) of the side tripping push rod (2) and the lock buckle (3).

7. The eccentric tripping structure of a circuit breaker according to claim 1, wherein: The side tripping push rod (2) is in a "Z" shape.

8. The eccentric tripping structure of a circuit breaker according to claim 1, wherein: The sealing ribs (502) provided on the housing (5) cooperate with the extensions (601) on the contact support (6) to enhance the sealing performance of the contact system when the moving contact (a) and the static contact (b) are in the open state.

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